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The circuit shown in Fig. 19-67 uses a neon-filled tube as in Fig. 19-23a. This neon lamp has a threshold voltage V) for conduction, because no current flows until the neon gas in the tube is ionized by a sufficiently strong electric has negligible resistance. The capacitor stores electrical energy, which can be released to flash the lamp. Assume that C = 0.150μF, R = 2.35 X 106 Ω, Vo = 90.0V and ε = 105V.
(a) Assuming that the circuit is hooked up to the emf at time t = 0, at what time will the light first flash?
(b) If the value of R is increased, will the time you found in part (a) increase or decrease?
(c) The Flashing of the lamp is very brief. Why?
(d) Explain what happens after the lamp flashes for the first time? |
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